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I have a 2001 F350 4-door 7.3 diesel...single rear wheel.
I installed a Summit Racing 3" leveling kit up front last year and 20" wheels. Tires are wider (14" I think) and taller (about 34") than stock and Nittos.
I'm hearing a "bump...bump" from the front end on a regular basis. More so when backing into a parking spot or at low-speed turning.